refactor(theme): retire the --color-* shim — the sweep it promised, run

#2533. theme.css claimed "removing this block is a rename sweep across the
components, tracked separately" — written in 67a529a, never filed, which made
the comment itself an instance of the survey's presence-without-reference
pattern. This is that sweep.

73 alias declarations deleted; 69 files rewritten; every --color-*-style name
now references its --fs-* token directly. Mechanical by construction: the map
IS the alias block, applied longest-name-first with a boundary guard so
--color-text never matched inside --color-text-muted. Zero survivors outside
theme.css, verified by grep rather than assumed.

One deliberate survivor: --color-shadow stays DECLARED, because it was never
an alias — it is a literal value the design system has no token for. Marked
in place as a recorded gap: promote it to an --fs-* token when a second app
needs it, don't copy the line.

Nothing is lost mode-wise: the aliases' resolve-at-use-time trick (which
absorbed 48 dark-mode overrides) lives one layer down in the --fs-* tokens'
own derivations, which is why the sweep is a pure rename. Both CSS checkers
green.

Why now rather than never: check_snippets_against_design_system reports every
--color-* reference as "unknown — renders as NOTHING", and nine recipe
snippets recorded from components.css carried the deprecated names, making
them prior art pointing the wrong way. With the sweep in, the checker's
report over re-recorded snippets should be EMPTY — the acceptance test that
proves the checker was right all along (#2517's correction).

Refs #2533

frontend/src/components/rules/PlanRulesPanel.vue

@@ -46,7 +46,7 @@ watch(() => props.projectId, load);
 <style scoped>
 .plan-rules {
   margin-top: 1.5rem;
-  border-top: 1px solid var(--color-border);
+  border-top: 1px solid var(--fs-border-color);
   padding-top: 1rem;
 }
 .plan-rules h3 {
@@ -66,7 +66,7 @@ watch(() => props.projectId, load);
 }
 .plan-rules ul {
   list-style: none; padding-left: 0.75rem; margin: 0.25rem 0;
-  border-left: 2px solid var(--color-primary);
+  border-left: 2px solid var(--fs-accent);
 }
 .plan-rules li { margin: 0.35rem 0; font-size: 0.92em; }
 .truncated { opacity: 0.7; font-style: italic; font-size: 0.85em; }

frontend/src/components/rules/ProjectRulesTab.vue

@@ -329,7 +329,7 @@ h3 {
 .chips { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }
 .chip {
   display: inline-flex; align-items: center; gap: 0.25rem;
-  background: var(--color-primary-bg);
+  background: var(--fs-accent-soft);
   padding: 0.25rem 0.5rem; border-radius: 999px;
 }
 .chip a { cursor: pointer; }
@@ -337,13 +337,13 @@ h3 {
 .chip-remove:hover { opacity: 1; }
 .add {
   background: none;
-  border: 1px dashed var(--color-border);
+  border: 1px dashed var(--fs-border-color);
   padding: 0.25rem 0.75rem; border-radius: 999px; cursor: pointer;
   color: inherit;
 }
 select {
-  background: var(--color-bg); color: inherit;
-  border: 1px solid var(--color-border); border-radius: 6px;
+  background: var(--fs-surface-page); color: inherit;
+  border: 1px solid var(--fs-border-color); border-radius: 6px;
   padding: 0.25rem 0.5rem;
 }
 .applicable { margin-top: 2rem; }
@@ -359,7 +359,7 @@ select {
 }
 ul { list-style: none; padding: 0; margin: 0; }
 .rule {
-  border-left: 2px solid var(--color-primary);
+  border-left: 2px solid var(--fs-accent);
   padding-left: 0.75rem; margin: 0.5rem 0;
 }
 .rule-head { cursor: pointer; }
@@ -367,12 +367,12 @@ ul { list-style: none; padding: 0; margin: 0; }
 .rule-statement { display: block; opacity: 0.85; margin-top: 0.25rem; }
 .rule-detail {
   margin-top: 0.5rem; padding: 0.5rem;
-  background: var(--color-bg); border-radius: 6px;
+  background: var(--fs-surface-page); border-radius: 6px;
 }
 .rule-detail > div { margin-bottom: 0.5rem; }
 .edit-link {
   background: none; border: none; cursor: pointer;
-  color: var(--color-primary); padding: 0.5rem 0 0 0;
+  color: var(--fs-accent); padding: 0.5rem 0 0 0;
 }
 .empty, .truncated { opacity: 0.7; font-style: italic; }
 .empty a { cursor: pointer; text-decoration: underline; }
@@ -381,18 +381,18 @@ ul { list-style: none; padding: 0; margin: 0; }
 .new-rule-form {
   display: flex; flex-direction: column; gap: 0.5rem;
   padding: 0.75rem; margin: 0.5rem 0;
-  background: var(--color-bg);
-  border: 1px solid var(--color-border); border-radius: 6px;
+  background: var(--fs-surface-page);
+  border: 1px solid var(--fs-border-color); border-radius: 6px;
 }
 .new-rule-form input, .new-rule-form textarea {
-  background: var(--color-surface); color: inherit;
-  border: 1px solid var(--color-border); border-radius: 6px;
+  background: var(--fs-surface-hover); color: inherit;
+  border: 1px solid var(--fs-border-color); border-radius: 6px;
   padding: 0.5rem; font: inherit; resize: vertical;
 }
 .rule-list { margin-top: 0.5rem; }
 .delete-link {
   background: none; border: none; cursor: pointer;
-  color: var(--color-destructive); padding: 0.5rem 0 0 0;
+  color: var(--fs-destructive); padding: 0.5rem 0 0 0;
 }
 /* Per-rule / per-topic suppress affordance — quiet by default, reveal on hover */
 .topic-group h5 {
@@ -404,14 +404,14 @@ ul { list-style: none; padding: 0; margin: 0; }
 .rule-head-text { flex: 1; cursor: pointer; }
 .skip-btn {
   background: none; border: none; cursor: pointer;
-  color: var(--color-muted); font-size: 0.75rem;
+  color: var(--fs-text-tertiary); font-size: 0.75rem;
   padding: 0.1rem 0.4rem; opacity: 0; transition: opacity 0.15s;
   white-space: nowrap;
 }
 .topic-group h5:hover .skip-btn,
 .rule:hover .skip-btn,
 .skip-btn:focus { opacity: 1; }
-.skip-btn:hover { color: var(--color-destructive); }
+.skip-btn:hover { color: var(--fs-destructive); }
 /* Suppressed section */
 .suppressed { margin-top: 1.5rem; }
 .suppressed-toggle {
@@ -430,13 +430,13 @@ ul { list-style: none; padding: 0; margin: 0; }
 .suppressed-kind {
   font-size: 0.7em; text-transform: uppercase; letter-spacing: 0.05em;
   padding: 0.1rem 0.4rem; border-radius: 3px;
-  background: var(--color-bg);
-  border: 1px solid var(--color-border);
+  background: var(--fs-surface-page);
+  border: 1px solid var(--fs-border-color);
 }
 .suppressed-path { flex: 1; }
 .reenable-btn {
   background: none; border: none; cursor: pointer;
-  color: var(--color-primary); font-size: 0.85em;
+  color: var(--fs-accent); font-size: 0.85em;
 }
 .reenable-btn:hover { text-decoration: underline; }
 </style>

frontend/src/components/rules/RuleEditorSlideOver.vue

@@ -98,8 +98,8 @@ watch(() => props.ruleId, load);
 .slide-over {
   position: fixed; top: 0; right: 0; bottom: 0;
   width: min(520px, 90vw);
-  background: var(--color-surface);
-  border-left: 2px solid var(--color-primary);
+  background: var(--fs-surface-hover);
+  border-left: 2px solid var(--fs-accent);
   padding: 1.5rem;
   overflow-y: auto;
   box-shadow: -8px 0 32px rgba(0, 0, 0, 0.3);
@@ -110,11 +110,11 @@ header h2 {
   font-family: Fraunces, serif; font-style: italic;
 }
 label { display: block; margin-bottom: 1rem; }
-.required { color: var(--color-primary); }
+.required { color: var(--fs-accent); }
 input, textarea {
   width: 100%; margin-top: 0.25rem;
-  background: var(--color-bg); color: inherit;
-  border: 1px solid var(--color-border); border-radius: 6px;
+  background: var(--fs-surface-page); color: inherit;
+  border: 1px solid var(--fs-border-color); border-radius: 6px;
   padding: 0.5rem; font: inherit;
   font-family: inherit;
 }

frontend/src/components/rules/RuleListPane.vue

@@ -22,18 +22,18 @@ const emit = defineEmits<{
 </template>
 
 <style scoped>
-.pane { background: var(--color-surface); padding: 1rem; overflow-y: auto; }
+.pane { background: var(--fs-surface-hover); padding: 1rem; overflow-y: auto; }
 header h2 { font-family: Fraunces, serif; font-style: italic; margin: 0 0 0.5rem 0; }
 ul { list-style: none; padding: 0; margin: 1rem 0; }
 li {
   padding: 0.75rem;
   cursor: pointer;
   border-radius: 6px;
-  border-left: 2px solid var(--color-primary);
+  border-left: 2px solid var(--fs-accent);
   margin-bottom: 0.5rem;
   background: rgba(255, 255, 255, 0.02);
 }
-li:hover { background: var(--color-hover); }
+li:hover { background: var(--fs-surface-hover); }
 .title { font-family: Fraunces, serif; font-style: italic; font-size: 1.05em; }
 .statement { font-size: 0.9em; opacity: 0.8; margin-top: 0.25rem; }
 .new-rule { cursor: pointer; }

frontend/src/components/rules/RulebookDetailPane.vue

@@ -122,7 +122,7 @@ watch(() => props.rulebookId, () => {/* re-render of isSubscribed from existing
 </template>
 
 <style scoped>
-.pane { background: var(--color-surface); padding: 1rem; overflow-y: auto; }
+.pane { background: var(--fs-surface-hover); padding: 1rem; overflow-y: auto; }
 header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
 header h2 { font-family: Fraunces, serif; font-style: italic; margin: 0 0 0.5rem 0; }
 .always-on-toggle {
@@ -133,8 +133,8 @@ header h2 { font-family: Fraunces, serif; font-style: italic; margin: 0 0 0.5rem
 .always-on-toggle input { cursor: pointer; }
 ul { list-style: none; padding: 0; margin: 1rem 0; }
 li { padding: 0.5rem; cursor: pointer; border-radius: 6px; }
-li.active { background: var(--color-primary-bg); }
-li:hover { background: var(--color-hover); }
+li.active { background: var(--fs-accent-soft); }
+li:hover { background: var(--fs-surface-hover); }
 /* `.new-topic` and `.sub-list` are deliberately bare (#2444). The first wraps a
    button-or-form whose children style themselves; the second is a `<ul>`, and
    the bare `ul` rule above already gives it list-style, padding and margin —
@@ -142,14 +142,14 @@ li:hover { background: var(--color-hover); }
    selector. Both namespace descendant rules and assume nothing about layout. */
 .new-topic input {
   width: 100%; margin-bottom: 0.5rem;
-  background: var(--color-bg); color: inherit;
-  border: 1px solid var(--color-border); border-radius: 6px;
+  background: var(--fs-surface-page); color: inherit;
+  border: 1px solid var(--fs-border-color); border-radius: 6px;
   padding: 0.5rem;
 }
 .form-buttons { display: flex; gap: 0.5rem; }
 .subscriptions {
   margin-top: 2rem;
-  border-top: 1px solid var(--color-border);
+  border-top: 1px solid var(--fs-border-color);
   padding-top: 1rem;
 }
 .subscriptions h3 { font-size: 0.9em; opacity: 0.7; text-transform: uppercase; letter-spacing: 0.05em; }

frontend/src/components/rules/RulebookListPane.vue

@@ -48,27 +48,27 @@ async function submitNew() {
 </template>
 
 <style scoped>
-.pane { background: var(--color-surface); padding: 1rem; overflow-y: auto; }
+.pane { background: var(--fs-surface-hover); padding: 1rem; overflow-y: auto; }
 header h2 { font-family: Fraunces, serif; font-style: italic; margin: 0 0 0.5rem 0; }
 ul { list-style: none; padding: 0; margin: 1rem 0; }
 li { padding: 0.5rem; cursor: pointer; border-radius: 6px; display: flex; align-items: center; gap: 0.5rem; }
-li.active { background: var(--color-primary-bg); }
-li:hover { background: var(--color-hover); }
+li.active { background: var(--fs-accent-soft); }
+li:hover { background: var(--fs-surface-hover); }
 .always-on-badge {
   font-size: 0.7rem;
   text-transform: uppercase;
   letter-spacing: 0.05em;
   padding: 0.1rem 0.4rem;
   border-radius: 3px;
-  background: var(--color-accent);
-  color: var(--color-accent-fg);
+  background: var(--fs-accent);
+  color: var(--fs-text-on-action);
   margin-left: auto;
 }
 .new-rulebook { margin-top: 1rem; }
 .new-rulebook input {
   width: 100%; margin-bottom: 0.5rem;
-  background: var(--color-bg); color: inherit;
-  border: 1px solid var(--color-border); border-radius: 6px;
+  background: var(--fs-surface-page); color: inherit;
+  border: 1px solid var(--fs-border-color); border-radius: 6px;
   padding: 0.5rem;
 }
 .form-buttons { display: flex; gap: 0.5rem; }